X = int(input())

if X >= 30:
    print("Yes")
else:print("No") X = int(input()) X int(input()) int input() input if X >= 30:
    print("Yes")
else:print("No") X >= 30 X 30 print("Yes") print "Yes" X = int(input()) int(input()) X
X = int(input())

if X >= 30:
    print("Yes")
else:print("No")
